Improvement in device for sharpening the cutters of mowing-machines



Unire-D STATES PATENT FFIGE.

WARREN TANNER, OF CHICAGO, ILLINOIS, ASSIGNOR TO HIMSELF' AND A OLIVER BASOOlVI, OF WHITEHALL, NEW YORK.

IMPROVEMENT IN DEVICE FOR SHARPENING THE CUTTERS 0F MOWING-IIIIACHINES.

Specification forming part of Letters Patent No. 90,407, dated May 25, 1869.

To all 'whom it may concern:

Be it known that I, WARREN .IANNER, of Chicago, in the county of lCook and State of Illinois, have invented certain new and useful Improvements in Means for Sharpening the Cutters of IIarvcsters, and I do hereby declare that the following is a full and exact description thereof.

My invention is adapted for grinding the cutters, by holding by hand with ordinary skill, without removing them from the bar or plate to which they are fastened.

I will first describe what I consider the best means of carrying out my invention, and will afterward designate the point which I believe to be new therein.

The accompanying drawings form a part of this specification. I

Figure lis a front view. Fig. 2 is a side view. Fig. r3 is a plan view; and Fig. 4 is a perspective view, showing the driving-wheel mounted on a separate frame and less in the way of the feet of the operator.

Either arrangement of these parts may be used; but I prefer that shown in Fig. 4: for

with its periphery beveled, as represented, so-

as to exactly match into the angle between two cutters. lt will be of course observed that the bevel required is modified by the fact that the cutters are held above the plane of the axis of the grinding-wheel. B isa disk of metal, which supports one side, and C is a nut on a corresponding thread in the shaft D. E is a slieavc, fitting against the other side of the wheel A, and which may be for ed in one piece with the shaft D. The grintA stone A is iirmly held between the sheave E and the plate or washer B. The shaft l) proj eets at each end sufficiently to form a journal. These journals are support-ed in bearings in stout rods G1 G2, which extend up from the face-castin g G, which may be bolted or otherwise fixed on the supporting-post M. The shaft D is turned rapidly by the round belt I from the drivingwheel H, which is turned by the handle h.

The driving-wheel may be of any size desired, and so may its operating-crank; but the wheel A and its supports, the pulley or sheave E, Src., mustbe necessarily of smallv dimensions.

I prefer the following The wheel A is eight inches in diameter and one inch thick. The sheave E is three inches in diameter and about three-fourths of an inch in thickness, and the thickness of the nut C and washer B together is one and one=fourth inch. The length of the bearings may be one inch.

When the cutters become dulled, the cutterbar is removed from the harvester, and is held by hand upon the grinding-wheel A, While a boy or other assistant turns the driving-wheel II. The wheel H operates the belt I, and the grinding wheel A being thus rapidly and steadily revolved, the cutters, on being present-ed thereto, and successively shifted and moved at the proper angles to sharpen theI cutting-edges throughout their whole extent, are rapidly sharpened, and the cutter-bar is again replaced in the machine and connected for operation.

I have experimented with my machine, and liu'd that the time consumed in sharpening the cutters is much less than with those devices in which the cutter-bar has to be secured in a frame to hold it with its cutters for sharpening.

I am not aware of any machine prior to mine in which the grinding-wheel and its adj uncts, A

considered collectively, occupy so small aspace that they may be opera-ted, like mine, in the an gle between two teeth. It is not indispensable to give the grinding-surface the double bevel. represented, because by turning tne cutter bar -very much, which my invention allows,

the edges may be sharpened on plain cylinieia1ly,`i ,the manner described in the patent issued to self and others, dated March 6, lSGG-that is to say, compounded of coarse emery, llour-emery, and sulphur; but any suitable natural or artificial material may be used.

Having now fully described my invention, what 1 claim as new, and desire to secure by Letters Patent, is as follows:

The Within-deseribed device for sharpening harvester and mowing-machine cutters, oonsistiug of the standards Gl- G2, shaft D, grinding-Wheel A, driving slieave or pulley E, clampwasher and nut B C, the Wholev arranged as and for the purpose l1 erein set forth.

' NVARREN TANNER. Vitnesses M. W. HAMMOND, S. S. SGRIBNER. 

